private void UpdateSource()
{
using RoleData roleData = new RoleData(settings.ConnectionString);
using PositionData positionData = new PositionData(settings.ConnectionString);
using PermissionData permissionData = new PermissionData(settings.ConnectionString);
List <RoleModel> retrievedRoles = roleData.GetDataCollection();
retrievedRoles.ForEach(x => Roles.Add(x));
Roles.Remove(Roles.FirstOrDefault(r => r.Name.Equals("Administrator")));
Roles.Remove(Roles.FirstOrDefault(r => r.Name.Equals("nullRole")));
List <PositionModel> retrievedPositions = positionData.GetDataCollection();
retrievedPositions.ForEach(x => Positions.Add(x));
Positions.Remove(Positions.FirstOrDefault(r => r.Name.Equals("Директор")));
List <PermissionModel> retrievedPermissions = permissionData.GetDataCollection();
retrievedPermissions.ForEach(x => Permissions.Add(x));
FillListCollections();
}
